The experience was great! I do wosh they did a briefing prior to boarding the boat... some people were talking and the instructions never made it through my ear. However, the staff was helpful in guiding you throughout the event. They split you into two groups. One group either starts with snorkeling and the other with underwater electric submarine. You will be able to see the fish. We were fortunate to see a turtle and an octopus. You have a diver with you as you go on the submarine scooter.
It is strongly suggested you have some swimming experience... the water is not neck deep. It is very deep and you can drown. However, like I say, the diver will help you mount onto the scooter and dismount, making sure you do not drown.
Overall great experience. They had bags of chips available for snacks and a jug of water with cups for you.